Thank you for your reply.
Before my friend got Morbol Green, she had Hunter Green. I've found the calculator after I made that post, so she did feed him 1x Pear and 5x Apple and actually got back to Hunter Green.
EDIT: She just told me, that she read someone got Soot Black after feeding 2 Berries and 3 Apples. She will try it with that combo now.
